assimp/tools/assimp_view/Normals.cpp

/*
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Open Asset Import Library (assimp)
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  following disclaimer.

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*/


#include "assimp_view.h"

// note: these are no longer part of the public API, but they are 
// exported on Windows to keep AssimpView alive.
#include "GenFaceNormalsProcess.h"
#include "GenVertexNormalsProcess.h"
#include "JoinVerticesProcess.h"
#include "CalcTangentsProcess.h"
#include "MakeVerboseFormat.h"

namespace AssimpView {

using namespace Assimp;

bool g_bWasFlipped = false;
float g_smoothAngle = 80.f;

//-------------------------------------------------------------------------------
// Flip all normal vectors
//-------------------------------------------------------------------------------
void AssetHelper::FlipNormalsInt()
{
	// invert all normal vectors
	for (unsigned int i = 0; i < this->pcScene->mNumMeshes;++i)
	{
		aiMesh* pcMesh = this->pcScene->mMeshes[i];
	
		if (!pcMesh->mNormals)
			continue;

		for (unsigned int a = 0; a < pcMesh->mNumVertices;++a){
			pcMesh->mNormals[a] *= -1.0f;
		}
	}
}

//-------------------------------------------------------------------------------
void AssetHelper::FlipNormals()
{
	FlipNormalsInt();

	// recreate native data
	DeleteAssetData(true);
	CreateAssetData();
	g_bWasFlipped = ! g_bWasFlipped;
}

//-------------------------------------------------------------------------------
// Set the normal set of the scene
//-------------------------------------------------------------------------------
void AssetHelper::SetNormalSet(unsigned int iSet)
{
	// we need to build an unique set of vertices for this ...
	{
		MakeVerboseFormatProcess* pcProcess = new MakeVerboseFormatProcess();
		pcProcess->Execute(pcScene);
		delete pcProcess;

		for (unsigned int i = 0; i < pcScene->mNumMeshes;++i)
		{
			if (!apcMeshes[i]->pvOriginalNormals)
			{
				apcMeshes[i]->pvOriginalNormals = new aiVector3D[pcScene->mMeshes[i]->mNumVertices];
				memcpy( apcMeshes[i]->pvOriginalNormals,pcScene->mMeshes[i]->mNormals,
					pcScene->mMeshes[i]->mNumVertices * sizeof(aiVector3D));
			}
			delete[] pcScene->mMeshes[i]->mNormals;
			pcScene->mMeshes[i]->mNormals = NULL;
		}
	}


	// now we can start to calculate a new set of normals
	if (HARD == iSet)
	{
		GenFaceNormalsProcess* pcProcess = new GenFaceNormalsProcess();
		pcProcess->Execute(pcScene);
		FlipNormalsInt();
		delete pcProcess;
	}
	else if (SMOOTH == iSet)
	{
		GenVertexNormalsProcess* pcProcess = new GenVertexNormalsProcess();
		pcProcess->SetMaxSmoothAngle((float)AI_DEG_TO_RAD(g_smoothAngle));
		pcProcess->Execute(pcScene);
		FlipNormalsInt();
		delete pcProcess;
	}
	else if (ORIGINAL == iSet)
	{
		for (unsigned int i = 0; i < pcScene->mNumMeshes;++i)
		{
			if (apcMeshes[i]->pvOriginalNormals)
			{
				delete[] pcScene->mMeshes[i]->mNormals;
				pcScene->mMeshes[i]->mNormals = apcMeshes[i]->pvOriginalNormals;
				apcMeshes[i]->pvOriginalNormals = NULL;
			}
		}
	}

	// recalculate tangents and bitangents
	Assimp::BaseProcess* pcProcess = new CalcTangentsProcess();
	pcProcess->Execute(pcScene);
	delete pcProcess;

	// join the mesh vertices again
	pcProcess = new JoinVerticesProcess();
	pcProcess->Execute(pcScene);
	delete pcProcess;

	iNormalSet = iSet;

	if (g_bWasFlipped)
	{
		// invert all normal vectors
		for (unsigned int i = 0; i < pcScene->mNumMeshes;++i)
		{
			aiMesh* pcMesh = pcScene->mMeshes[i];
			for (unsigned int a = 0; a < pcMesh->mNumVertices;++a)
			{
				pcMesh->mNormals[a] *= -1.0f;
			}
		}
	}

	// recreate native data
	DeleteAssetData(true);
	CreateAssetData();
	return;
}

};